Fuse these CZ's into your glass art. These have been tested by us. We are able to embed these in our work consistently. These stones are not a "Tested Compatible" product. We have tested random samples from our current stock. We will continue to test the batches of stones as they arrive. However we would like to make it clear that we are not guaranteeing compatibility. We recommend doing your own compatibility test with the glass combinations you choose. To use these simply drill a small hole in the glass and insert the Cubic Zirconia. Cubic Zirconia, also known as loose CZ, has a long history. It is a man-made composition created to simulate the diamond. Brilliant cut, beautiful shine and loupe clean, Cubic Zirconia White AAA quality has become one of the most popular CZ products on the market. Our AAA quality CZ rounds can match or surpass the beauty and brilliance of many diamonds.